package com.qingyun.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.qingyun.reggie.common.BaseContext;
import com.qingyun.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * 检查是否登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();

        log.info("拦截到的请求{}",requestURI);
        /**
         * 需要放行的路径
         */
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
//                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录

        };

        boolean check = check(urls, requestURI);
        if (check){
            log.info("本次请求不需要处理", requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        /**
         * 已登录直接放行
         */
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录id为{}",request.getSession().getAttribute("employee"));
            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //    用户登录- 如果已登录，就直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，登录的id为： {}", request.getSession().getAttribute("user"));
            // 把id保存到当前ThreadLocal线程中。
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            // 放行。
            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        /**
         * 未登录返回未登录结果，通过输出流向客户端响应数据
         */
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }

        }
        return false;
    }
}
